| Operating system | Developer | First release | License |
|---|---|---|---|
| 86-DOS | Seattle Computer Products, Tim Paterson | 1980 | — |
| CP/M | Digital Research, Gary Kildall | — | BSD licenses |
| CP/M-86 | Digital Research | — | proprietary license |
| DOS Plus | Digital Research | — | — |
| MP/M | Digital Research, Tom Rolander | — | proprietary license |
| MS-DOS | Microsoft | 1981 | MIT License, proprietary license |
| TurboDOS | — | — | — |
| Windows 1.0 | Microsoft, NEC | 1985 | end-user license agreement |